Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: bpf: Reject negative optlen in cgroup getsockopt hook A cgroup getsockopt BPF program can shrink ctx->optlen after the kernel getsockopt handler has run. The kernel-buffer variant, used by TCP_ZEROCOPY_RECEIVE, only rejects values larger than the original length. If BPF writes a negative optlen, that value is accepted and propagated back to the TCP getsockopt code. It can then be passed to copy_to_sockptr() as a size_t and trigger the hardened usercopy bytes > INT_MAX warning. Reject negative ctx.optlen in __cgroup_bpf_run_filter_getsockopt_kern(), matching the lower-bound validation already present in the sockptr-based getsockopt hook.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 08f61a34913558e06576e7b6318bf583f273c1be before 5b09d984b38b018b123c3a9e02a96bbc6468dbe5; affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f before 554ba7195c4108726450e24480c8449990c2268c; affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f before d02a12b4085ffe41ea750b1007f7a9c7aee2875a; affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f before e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2; affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f before f68671b1a98d426c57864bd457c125fee14ac1a5; affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f before 2bdbe00454200fcb0110f31eeca8d906a3515e74; affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f before 31a89af4f513d750fec196e2bb6195a7d4473e9f; affected 9cacf81f8161111db25f98e78a7a0e32ae142b3f before 1b5aacd5b2419b0790e955e466d389a61c79b4b1; affected 5.10.188 before 5.10.270 |
| Linux / Linux | affected 5.12; unaffected 0 before 5.12; unaffected 5.10.270 through 5.10.*; unaffected 5.15.221 through 5.15.*; unaffected 6.1.188 through 6.1.*; unaffected 6.6.157 through 6.6.*; unaffected 6.12.110 through 6.12.*; unaffected 6.18.52 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/5b09d984b38b018b123c3a9e02a96bbc6468dbe5
- https://git.kernel.org/stable/c/554ba7195c4108726450e24480c8449990c2268c
- https://git.kernel.org/stable/c/d02a12b4085ffe41ea750b1007f7a9c7aee2875a
- https://git.kernel.org/stable/c/e6fbf0eba87f50084d67508898f6ad6fc7ff1ba2
- https://git.kernel.org/stable/c/f68671b1a98d426c57864bd457c125fee14ac1a5
- https://git.kernel.org/stable/c/2bdbe00454200fcb0110f31eeca8d906a3515e74
- https://git.kernel.org/stable/c/31a89af4f513d750fec196e2bb6195a7d4473e9f
- https://git.kernel.org/stable/c/1b5aacd5b2419b0790e955e466d389a61c79b4b1